You have a little ways to go, and only focusing on mainline quests may slow your progression. Side quests will give you the experience you need to progress further.

Only players who have reached level 48 and completed the Dragonspyre quest "The Final Countdown" should speak to Merle Ambrose for more information about Celestia.If you haven't already, I suggest you spend some time working your way through Grizzleheim and into Wintertusk - this experience (and access to those zones) will be very valuable to you soon...

Yes i agree with Prof. Greyrose (sorry if i spelt name wrong) it is very important to do what u can in grizzleheim lots of xp and u will need it for other things.......i am not gonna spoil anything though